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The flexible low-frequency transmission system is superior in enhancing transmission capacity, reducing line charging reactive power, and improving voltage quality at the end of transmission channels, which can effectively meet the urgent demand for efficient aggregation and transmission of medium- and long-distance offshore wind power. In order to study the operating characteristics of submarine cables under low frequency condition, an electric-magnetic-thermal-flow coupled finite element simulation model of 220 kV cross-linked polyethylene was built considering the influence of external laying environment, and the steady-state ampacity and temperature field distribution of submarine cables operating at 50 Hz and 20 Hz in different laying sections were analyzed. The finite element simulation was verified by building a steady-state thermal path model of submarine cable on the basis of IEC 60287:1995 and previous simulation results of thermal field distributions in submarine cable under low frequency. The results show that under different laying environments of land section, sea section, and submarine section, the relative errors between the ampacity and temperature field distribution calculation results of simulation model and the analytical equation of IEC are within 3%, indicating that the temperature field simulation model of 220 kV cross-linked cable proposed in this paper has good accuracy and high efficiency. Meanwhile, it is found that the frequency reduction can reduce the AC resistance of cable conductor, improve the current distribution in the cable conductor, and reduce the operating loss of each part of cable, thereby the overall operating temperature of cable is reduced eventually and the cable transmission capacity is improved favorably.
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柔性低频输电系统在提升输电容量、减小线路充电无功、改善输电通道末端电压质量等方面具有优越性,可以有效满足中、远距离海上风电高效汇集送出等迫切需求。为研究海底电缆在低频条件下的运行特性,本文搭建了考虑外界敷设环境影响下的220 kV交联聚乙烯电-磁-热-流多物理场耦合有限元仿真模型,分析了不同敷设段中50 Hz和20 Hz频率下运行的海底电缆稳态载流量和温度场分布情况,并基于IEC 60287:1995建立的海底电缆稳态热路模型和低频海缆发热仿真的典型案例,对有限元仿真进行验证。结果表明:在陆地段、入海段和海底段等不同敷设环境下,仿真模型的载流量和温度场分布计算结果与IEC解析公式的相对误差都在3%以内,表明本文提出的220 kV交联电缆温度场仿真模型具有较好的准确性和有效性;频率降低可以减小线芯交流电阻值、改善电缆导体中的电流分布、减小电缆各部分的运行损耗,从而降低电缆的整体运行温度,有利提升电缆的传输容量。
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吴冰洁(1997-),女(汉族),四川眉山人,硕士生,主要研究方向为海底电缆的低频特性分析及仿真;
卢武(1991-),男(汉族),安徽亳州人,副教授,主要研究方向为液相放电机理与高压绝缘数值计算。
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1School of Electric Engineering, Shanghai University of Electric Power, Shanghai 200090, China
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1上海电力大学 电气工程学院,上海 200090
2国网上海市电力公司培训中心,上海 200438, bio={"content":"
吴冰洁(1997-),女(汉族),四川眉山人,硕士生,主要研究方向为海底电缆的低频特性分析及仿真;
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吴冰洁(1997-),女(汉族),四川眉山人,硕士生,主要研究方向为海底电缆的低频特性分析及仿真;
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3国网上海市电力公司市区供电公司,上海 200080, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1211320078260367360, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, xref=3, ext=[AuthorCompanyExt(id=1211320078268755969, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, companyId=1211320078260367360, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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4State Grid Xiong'an New Area Electric Power Supply Company, Xiong′an 071600, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1211320078906290198, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, authorId=1211320078784655379, language=CN, stringName=陈晨, firstName=晨, middleName=null, lastName=陈, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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4国网雄安新区供电公司,河北 雄安 071600, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1211320078340059140, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, xref=4, ext=[AuthorCompanyExt(id=1211320078344253445, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, companyId=1211320078340059140, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1上海电力大学 电气工程学院,上海 200090, bio={"content":"
卢武(1991-),男(汉族),安徽亳州人,副教授,主要研究方向为液相放电机理与高压绝缘数值计算。
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卢武(1991-),男(汉族),安徽亳州人,副教授,主要研究方向为液相放电机理与高压绝缘数值计算。
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3State Grid Shanghai Urban Electric Power Supply Company, Shanghai 200080, China), AuthorCompanyExt(id=1211320078272950274, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, companyId=1211320078260367360, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3国网上海市电力公司市区供电公司,上海 200080)]), AuthorCompany(id=1211320078340059140, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, xref=4, ext=[AuthorCompanyExt(id=1211320078344253445, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, companyId=1211320078340059140, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
4State Grid Xiong'an New Area Electric Power Supply Company, Xiong′an 071600, China), AuthorCompanyExt(id=1211320078348447750, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, companyId=1211320078340059140, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
4国网雄安新区供电公司,河北 雄安 071600)])], figs=[ArticleFig(id=1211320080361713712, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.1, caption=
Schematic diagram of submarine cable laying environment, figureFileSmall=dCp2hlvqzkqjKhP6/Iri0w==, figureFileBig=NouuFxIgq3/mjZZB8Rjrhw==, tableContent=null), ArticleFig(id=1211320080416239665, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图1, caption=
海底电缆敷设环境示意图, figureFileSmall=dCp2hlvqzkqjKhP6/Iri0w==, figureFileBig=NouuFxIgq3/mjZZB8Rjrhw==, tableContent=null), ArticleFig(id=1211320080495931442, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.2, caption=
Schematic view of research work, figureFileSmall=8DV+LhD1W5J+0mCLehII5g==, figureFileBig=hoc/mDjB75ZBB+hpHZPQJg==, tableContent=null), ArticleFig(id=1211320080550457395, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图2, caption=
研究框架图, figureFileSmall=8DV+LhD1W5J+0mCLehII5g==, figureFileBig=hoc/mDjB75ZBB+hpHZPQJg==, tableContent=null), ArticleFig(id=1211320080609177652, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.3, caption=
The structural view of 220 kV three-core submarine cable, figureFileSmall=Kqc1sAFczqZtaD3TRcOYjQ==, figureFileBig=LNbJaQsmyd6iVMaDc6Bfkw==, tableContent=null), ArticleFig(id=1211320080659509301, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图3, caption=
220 kV三芯海底电缆结构示意图, figureFileSmall=Kqc1sAFczqZtaD3TRcOYjQ==, figureFileBig=LNbJaQsmyd6iVMaDc6Bfkw==, tableContent=null), ArticleFig(id=1211320080726618166, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.4, caption=
Submarine laying environment model, figureFileSmall=oRQmTNiKkZb8Lf7KnUurYQ==, figureFileBig=bhq6y/9hmTy7r9y4wOsB1Q==, tableContent=null), ArticleFig(id=1211320080797921335, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图4, caption=
海底电缆敷设环境模型, figureFileSmall=oRQmTNiKkZb8Lf7KnUurYQ==, figureFileBig=bhq6y/9hmTy7r9y4wOsB1Q==, tableContent=null), ArticleFig(id=1211320080856641592, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.5, caption=
Steady-state temperature field distribution in submarine cable under 50 Hz, figureFileSmall=67Jglvr2qA14DbQLgQeKLQ==, figureFileBig=0xmNkhuY7rWiGKD/F59sEg==, tableContent=null), ArticleFig(id=1211320080911167545, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图5, caption=
50 Hz下海底电缆的稳态温度场分布情况, figureFileSmall=67Jglvr2qA14DbQLgQeKLQ==, figureFileBig=0xmNkhuY7rWiGKD/F59sEg==, tableContent=null), ArticleFig(id=1211320082114932794, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.6, caption=
Steady-state temperature field distribution in submarine cable under 20 Hz, figureFileSmall=8Z5QuNFfxNmTV+OdFiBYGw==, figureFileBig=tVAiWGe25QNxeekk/rZInQ==, tableContent=null), ArticleFig(id=1211320082198818875, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图6, caption=
20 Hz下海底电缆的稳态温度场分布情况, figureFileSmall=8Z5QuNFfxNmTV+OdFiBYGw==, figureFileBig=tVAiWGe25QNxeekk/rZInQ==, tableContent=null), ArticleFig(id=1211320082261733436, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.7, caption=
Temperature field distribution of submarine cable with 700 A of current injected under 50 Hz, figureFileSmall=ZBUr6g0a/Hi51ncox6b6kg==, figureFileBig=n5oIEv9HTcHWdCgGqEqv2g==, tableContent=null), ArticleFig(id=1211320082324647997, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图7, caption=
50 Hz下通入700 A电流时的海底电缆温度场分布情况, figureFileSmall=ZBUr6g0a/Hi51ncox6b6kg==, figureFileBig=n5oIEv9HTcHWdCgGqEqv2g==, tableContent=null), ArticleFig(id=1211320082387562558, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.8, caption=
Temperature field distribution of submarine cable with 700 A of current injected under 20 Hz, figureFileSmall=CAOaWnxZLyUe2eZk93eVZQ==, figureFileBig=iTwa1hbNrptUoEDudS1cmw==, tableContent=null), ArticleFig(id=1211320082446282815, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图8, caption=
20 Hz下通入700 A电流时的海底电缆温度场分布情况, figureFileSmall=CAOaWnxZLyUe2eZk93eVZQ==, figureFileBig=iTwa1hbNrptUoEDudS1cmw==, tableContent=null), ArticleFig(id=1211320082509197376, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.9, caption=
Three-core AC submarine cable thermal circuit model based on IEC 60287:1995, figureFileSmall=kmebZnggtBopGP8JmFOyJw==, figureFileBig=ecq5Hml3prkZGw91JmUePw==, tableContent=null), ArticleFig(id=1211320082572111937, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图9, caption=
基于IEC 60287:1995的三芯交流海缆热路模型, figureFileSmall=kmebZnggtBopGP8JmFOyJw==, figureFileBig=ecq5Hml3prkZGw91JmUePw==, tableContent=null), ArticleFig(id=1211320082635026498, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.10, caption=
Effect of frequency change on the temperature distribution of three-core submarine cable, figureFileSmall=rpRfIr/Xwyrxt5PT9W7n/w==, figureFileBig=poWaFHWA6+8T+i8L+fLgvA==, tableContent=null), ArticleFig(id=1211320082693746755, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图10, caption=
频率改变对三芯海缆运行温度分布的影响, figureFileSmall=rpRfIr/Xwyrxt5PT9W7n/w==, figureFileBig=poWaFHWA6+8T+i8L+fLgvA==, tableContent=null), ArticleFig(id=1211320082756661316, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.11, caption=
The current density distribution of submarine cable with 900 A of current injected under 50 Hz, figureFileSmall=j8owZ9TpmIKZONYIhJ8Pvw==, figureFileBig=LecmHH0nm0lIVT9CorONrQ==, tableContent=null), ArticleFig(id=1211320082815381573, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图11, caption=
50 Hz下通入900 A电流时海底电缆的电流密度分布情况, figureFileSmall=j8owZ9TpmIKZONYIhJ8Pvw==, figureFileBig=LecmHH0nm0lIVT9CorONrQ==, tableContent=null), ArticleFig(id=1211320082882490438, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Fig.12, caption=
The current density distribution of submarine cable with 900 A of current injected under 20 Hz, figureFileSmall=qrnY8sBXDYYqDhi5jmtAdA==, figureFileBig=PO1Otbrgo85KZRx2gRO5CA==, tableContent=null), ArticleFig(id=1211320082970570823, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=图12, caption=
20 Hz下通入900 A电流时海底电缆的电流密度分布情况, figureFileSmall=qrnY8sBXDYYqDhi5jmtAdA==, figureFileBig=PO1Otbrgo85KZRx2gRO5CA==, tableContent=null), ArticleFig(id=1211320083046068296, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Tab.1, caption=
The main parameters of each layer structure of AC submarine cable, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构 | 半径/mm | 导热系数/(W/(m·K)) | 密度/(kg/m3) | 比热容/(J/(kg·K)) |
|---|
| 导体 | 48.8 | 400 | 9 000 | 385 |
| 导体屏蔽层 | 51.2 | 0.17 | 930 | 2 405 |
| 绝缘层 | 93.2 | 0.29 | 930 | 2 300 |
| 绝缘屏蔽层 | 95.2 | 0.17 | 930 | 2 405 |
| 合金铅套 | 104.2 | 35.3 | 11 370 | 127 |
| PE护套 | 110.2 | 0.29 | 930 | 2 300 |
| 内垫层 | 241.1 | 0.22 | 1 900 | 1 900 |
| 钢丝铠装 | 253.1 | 50 | 7 850 | 475 |
| 外护套 | 259.1 | 0.22 | 1 900 | 1 900 |
), ArticleFig(id=1211320083113177161, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=表1, caption=
交流海底电缆各层结构主要参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 结构 | 半径/mm | 导热系数/(W/(m·K)) | 密度/(kg/m3) | 比热容/(J/(kg·K)) |
|---|
| 导体 | 48.8 | 400 | 9 000 | 385 |
| 导体屏蔽层 | 51.2 | 0.17 | 930 | 2 405 |
| 绝缘层 | 93.2 | 0.29 | 930 | 2 300 |
| 绝缘屏蔽层 | 95.2 | 0.17 | 930 | 2 405 |
| 合金铅套 | 104.2 | 35.3 | 11 370 | 127 |
| PE护套 | 110.2 | 0.29 | 930 | 2 300 |
| 内垫层 | 241.1 | 0.22 | 1 900 | 1 900 |
| 钢丝铠装 | 253.1 | 50 | 7 850 | 475 |
| 外护套 | 259.1 | 0.22 | 1 900 | 1 900 |
), ArticleFig(id=1211320083201257546, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Tab.2, caption=
The temperatures in different layers of AC submarine cable with 700 A of current injected, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 陆地段温度/℃ | 海底段温度/℃ | 入海段温度/℃ |
|---|
| 50 Hz | 20 Hz | 50 Hz | 20 Hz | 50 Hz | 20 Hz |
|---|
| 导体中心 | 53.1 | 44.3 | 43.8 | 33.7 | 50.1 | 41.1 |
| 绝缘内侧 | 51.7 | 42.1 | 40.7 | 32.8 | 48.7 | 40.1 |
| 绝缘外侧 | 43.6 | 35.2 | 33.1 | 26.0 | 40.8 | 33.4 |
), ArticleFig(id=1211320083289337931, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=表2, caption=
通入700 A电流时交流海底电缆各层温度仿真数值
, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 陆地段温度/℃ | 海底段温度/℃ | 入海段温度/℃ |
|---|
| 50 Hz | 20 Hz | 50 Hz | 20 Hz | 50 Hz | 20 Hz |
|---|
| 导体中心 | 53.1 | 44.3 | 43.8 | 33.7 | 50.1 | 41.1 |
| 绝缘内侧 | 51.7 | 42.1 | 40.7 | 32.8 | 48.7 | 40.1 |
| 绝缘外侧 | 43.6 | 35.2 | 33.1 | 26.0 | 40.8 | 33.4 |
), ArticleFig(id=1211320083352252492, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Tab.3, caption=
The comparison of load capacity values for different frequency simulations of submarine cables, figureFileSmall=null, figureFileBig=null, tableContent=
| 仿真结果 | 位置 | 运行频率/Hz | 载流量/A | 低频下载流量提升效率/% |
|---|
| 本文仿真结果 | 陆地段 | 50 | 941 | 15.3 |
| 20 | 1 085 |
| 海底段 | 50 | 1 149 | 18.4 |
| 20 | 1 360 |
| 文献[23]仿真结果 | — | 50 | 703 | 13.4 |
| 16.7 | 797 |
), ArticleFig(id=1211320083406778445, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=表3, caption=
海缆不同频率仿真计算的载流量数值对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 仿真结果 | 位置 | 运行频率/Hz | 载流量/A | 低频下载流量提升效率/% |
|---|
| 本文仿真结果 | 陆地段 | 50 | 941 | 15.3 |
| 20 | 1 085 |
| 海底段 | 50 | 1 149 | 18.4 |
| 20 | 1 360 |
| 文献[23]仿真结果 | — | 50 | 703 | 13.4 |
| 16.7 | 797 |
), ArticleFig(id=1211320083469693006, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=EN, label=Tab.4, caption=
The operation losses in different sections of submarine cable under different frequencies, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 陆地段 | 海底段 | 入海段 |
|---|
| 50 Hz | 20 Hz | 50 Hz | 20 Hz | 50 Hz | 20 Hz |
|---|
| 线芯损耗/(W/m) | 55.033 | 51.134 | 51.489 | 47.904 | 53.382 | 49.773 |
| 屏蔽层损耗/(W/m) | 14.671 | 4.750 | 7.728 | 1.160 | 11.699 | 1.395 |
| 铠装损耗/(W/m) | 0.011 | 0.003 | 0.007 | 0.002 | 0.008 | 0.002 |
), ArticleFig(id=1211320083528413263, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1199644782558544135, language=CN, label=表4, caption=
不同频率下海缆各部分损耗的计算结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 位置 | 陆地段 | 海底段 | 入海段 |
|---|
| 50 Hz | 20 Hz | 50 Hz | 20 Hz | 50 Hz | 20 Hz |
|---|
| 线芯损耗/(W/m) | 55.033 | 51.134 | 51.489 | 47.904 | 53.382 | 49.773 |
| 屏蔽层损耗/(W/m) | 14.671 | 4.750 | 7.728 | 1.160 | 11.699 | 1.395 |
| 铠装损耗/(W/m) | 0.011 | 0.003 | 0.007 | 0.002 | 0.008 | 0.002 |
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